Event "The vSphere Distributed Switch ### configuration on the host differed from that of the vCenter Server" is triggered.
If you enabled verbose log for vpxd, the log shows which ESX is the cause of dvs out of sync.
YYYY-MM-DDTHH:MM:SS.MS+HH:MM verbose vpxd[06760] [Originator@6876 sub=DvsCore] Dvs [DVS_NAME] on host [[FQDN]] is out of sync with vc dvs spec
VMware vSphere ESXi
VMware vCenter Server
One or more ESX belong to the VDS is disconnected from vCenter Server.
Investigate the cause of disconnection between vCenter Server and ESX.
If the ESX doesn't use VDS, remove the ESX from VDS.